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/*
* Copyright (C) 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.client.android;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.ResultPointCallback;
import com.google.zxing.common.HybridBinarizer;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.preference.PreferenceManager;
import android.util.Log;
import java.util.Hashtable;
import java.util.Vector;
/**
* This thread does all the heavy lifting of decoding the images.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
final class DecodeThread extends Thread {
public static final String BARCODE_BITMAP = "barcode_bitmap";
private static final String TAG = "DecodeThread";
private Handler handler;
private final CaptureActivity activity;
private final MultiFormatReader multiFormatReader;
private final ResultPointCallback resultPointCallback;
DecodeThread(CaptureActivity activity, String mode, ResultPointCallback resultPointCallback) {
this.activity = activity;
multiFormatReader = new MultiFormatReader();
this.resultPointCallback = resultPointCallback;
// The prefs can't change while the thread is running, so pick them up once here.
if (mode == null || mode.length() == 0) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
boolean decode1D = prefs.getBoolean(PreferencesActivity.KEY_DECODE_1D, true);
boolean decodeQR = prefs.getBoolean(PreferencesActivity.KEY_DECODE_QR, true);
if (decode1D && decodeQR) {
setDecodeAllMode();
} else if (decode1D) {
setDecode1DMode();
} else if (decodeQR) {
setDecodeQRMode();
}
} else {
if (mode.equals(Intents.Scan.PRODUCT_MODE)) {
setDecodeProductMode();
} else if (mode.equals(Intents.Scan.ONE_D_MODE)) {
setDecode1DMode();
} else if (mode.equals(Intents.Scan.QR_CODE_MODE)) {
setDecodeQRMode();
} else {
setDecodeAllMode();
}
}
}
Handler getHandler() {
return handler;
}
@Override
public void run() {
Looper.prepare();
handler = new Handler() {
@Override
public void handleMessage(Message message) {
switch (message.what) {
case R.id.decode:
decode((byte[]) message.obj, message.arg1, message.arg2);
break;
case R.id.quit:
Looper.myLooper().quit();
break;
}
}
};
Looper.loop();
}
private void setDecodeProductMode() {
doSetDecodeMode(BarcodeFormat.UPC_A,
BarcodeFormat.UPC_E,
BarcodeFormat.EAN_13,
BarcodeFormat.EAN_8,
BarcodeFormat.RSS14);
}
/**
* Select the 1D formats we want this client to decode by hand.
*/
private void setDecode1DMode() {
doSetDecodeMode(BarcodeFormat.UPC_A,
BarcodeFormat.UPC_E,
BarcodeFormat.EAN_13,
BarcodeFormat.EAN_8,
BarcodeFormat.CODE_39,
BarcodeFormat.CODE_128,
BarcodeFormat.ITF,
BarcodeFormat.RSS14);
}
private void setDecodeQRMode() {
doSetDecodeMode(BarcodeFormat.QR_CODE);
}
/**
* Instead of calling setHints(null), which would allow new formats to sneak in, we
* explicitly set which formats are available.
*/
private void setDecodeAllMode() {
doSetDecodeMode(BarcodeFormat.UPC_A,
BarcodeFormat.UPC_E,
BarcodeFormat.EAN_13,
BarcodeFormat.EAN_8,
BarcodeFormat.CODE_39,
BarcodeFormat.CODE_128,
BarcodeFormat.ITF,
BarcodeFormat.RSS14,
BarcodeFormat.QR_CODE);
}
private void doSetDecodeMode(BarcodeFormat... formats) {
Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(3);
Vector<BarcodeFormat> vector = new Vector<BarcodeFormat>(formats.length);
for (BarcodeFormat format : formats) {
vector.addElement(format);
}
hints.put(DecodeHintType.POSSIBLE_FORMATS, vector);
hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
multiFormatReader.setHints(hints);
}
/**
* Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
* reuse the same reader objects from one decode to the next.
*
* @param data The YUV preview frame.
* @param width The width of the preview frame.
* @param height The height of the preview frame.
*/
private void decode(byte[] data, int width, int height) {
long start = System.currentTimeMillis();
Result rawResult = null;
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
rawResult = multiFormatReader.decodeWithState(bitmap);
} catch (ReaderException re) {
// continue
} finally {
multiFormatReader.reset();
}
if (rawResult != null) {
long end = System.currentTimeMillis();
Log.v(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
Bundle bundle = new Bundle();
bundle.putParcelable(BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
message.setData(bundle);
message.sendToTarget();
} else {
Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
message.sendToTarget();
}
}
}
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